DEVICE FOR TEACHING CONCEPTS OF NUMBERS AND MATHEMATICAL PRINCIPLES,申请号GB19730026726-传众专利搜索

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发明名称	DEVICE FOR TEACHING CONCEPTS OF NUMBERS AND MATHEMATICAL PRINCIPLES
摘要
申请公布号	GB1483452(A)	申请公布日期	1977.08.17
申请号	GB19730026726	申请日期	1974.08.22
申请人	WALKER H	发明人
分类号	G09B23/02;(IPC1-7):G09B23/02	主分类号	G09B23/02
代理机构		代理人
主权项
地址

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